John stttrrock



J. STURROCK.

PlTMAN CONNECTION FOR MOWERS.

APPLICATION FILED APR. 7, 1911.

Patented Sept. 2, 1919'.

Pavan/n CQM SLTroc/v, by 43% f TEE l sTATEs PATENT oEEIoE.

' j 'roH-NsTUEEoeK, oEoIIIoAGO, I'IlLINoIs, AssIGNOE, BY IvIEsNEessIGrNIvIENTs,` To

INTERNATIONAL HARVESTER COMPANY, i OOEIOEeTIoN OE NEw JERSEY.

PITMAN' CONNECTION EOEMOWERS. n

To all io/om z'imay concern: n

` ing at Chicago, in the county of Cook and State of Illinois, have inventedcertain `new and useful Improvements in Pitman Connections for Mowers, of which the, following is a full, clear, and exact speolfication.

'My invention relates to .pitman connectionsior mowers.

` The object of the inventionl is toprovide means whereby wear between the pitmanv and the associated and cooperating parts of the mower is` automatically compensated for and the .parts at all times are `held in proper adjustment. j

A further object isto provide means `or easily and quickly connecting and disconnecting the pitman to the mower parts cooperating therewith.

'These objects are attained by the use, in connection with pitman jaws or straps, Oi controllingmembers `by`m'eans of which the jawsmay bel clamped ;y further, bythe usey of controlling members by means of which the, jaws maybe spread;` and still further, by the useof controlling members for clamping or lspreading the jaws at the will of the operator.

In the drawings I have Jfor purposes of illustration shown specific embodiments which my invention may assume in practice. In these drawings, wherein corresponding reference characters indicate like parts throughout the several views Figure 1 is atop plan viewof the preferred form of my pitman; f

Fig.` 2 is a side View of the pitman shown in Fig. 1 the device being shown in its inverted position; n l

3 is a plan view of a modified form of pitman connection; and

. Fig. 4` is aside elevation of ,the device shown in Fig. 3.

Considering irstthe j aw controlling means shown at fthe grass'ward end of thepitman, I have illustrated three positions of the elements, `these elements belng shown in their y jaw closing position, in Jfull lines and in their jaw releasing and opening positions in dotted lines. To' clearly distinguish the elements in their dotted line positions, I have used the same reference characters employed for the full lline position, but have @played dotted lead lines where 'these rf- Specic'aton of Letters lfatent.

Patented sept. 2,1919.

.lpplgiationllell,,April` 7, 1917. Serial No. 160,588r

eronee characters indicate the clementsin their dotted line positions. I will. now describe in detail `the ,specific embodiments of my device as shown in the drawings. l

The grassward end of the body portion 1() of the pitman, preferably.V made of wood, has secured theretoby means yofJooltsi), two resilient jaws 11 and 12and these jaws are provided with registering slots 13, the eX- tremities of which are indicated by refer-` ence characters 14 and 15. Slidable in these registering slots, is a flat substantially forkslmped'1 automatic take-up and jaw opening member 16 having inner inclined bearing surfaces 17 which Acontact with and co-` operate with similarly inclinedbearing surfaces 18 on the outer portions ot the eupshaped bearings 19 onl the outer ends of the resilient jaws 1l and 12. The outer surfaces of thelmember 16 are inclined, as indicated at 20, and coperateas will be hereinafter described, with the inclined ,end walls 14 of the slots 13 in the jawsll and 12. The member 16 has anintegral stubblewardly extending shank 21 whichis encircled by a kspring 22, one `end of which bears against the` shoulder 23 at the stubble-.

wardI end of, the inclined surfaces 20.'r The other end of the Spring bears againstl a curved end portion 24 of a bell crank member 25,`said curved end portion being apertnred and loosely carried by the pin 26 which` secures the curved portion 24 against displacement thereon. l The bell crank member 25 is journaled at itsoppositeend on, a crank 27 mounted betweenthe resilient jaws 11 and 12 and provided withtrunnions 28` and 29 journaled in said jaws. Integral with the trunnions 29,.is anarm 30, whereby the crank and hell crank member may be manu` ally operated. The erank27 is inclinedor offset relative to the plane of the arm 30,as clearly shown in Fig. 1, and when the jaws 11 and 12 are clamped or closed, the `forceof the spring 22 is exerted` in a linepassing through the end 211 of the bell crank 25z andv the opposite endof said bell crank jonrnaled @alla @efteling luf-5S. israeliana inward.:

j bleward` endon a lever 34.

movement of the bell `crank 25 and maintains itin thev position shown in full ylines inFig'p2. c. n

In the controlling rmeans shown in Figs. 3 and 4, it will also be noted that the' shank 21, which is integral with the jaw opening member 16, is slidably mounted in thel grassv position, vthereby automatically compensatward end ofthe body portion 10 of the pitman and is normally forced outwardly by means of the spring 22 mountedthereon. It will also be seen thatthe operatingmecha-A nism for the jaw closing and openingmember 16 is slightlyrdilierent from that above described and consists in a longitudinally curved link 32 provided atv its grassward end lwitha hook 33 andV pivoted at its stub- The lever 34 is apertured at 35 and when in operative position ismountedlona stud 36y rigidly attachedto the body portion 10 of the pitman. Thel link 32 is offset or curved aty a point adjacent its pivotal Vconnection with the lever 34 in such a manner that when the lever is swung to jaw openingposition, the offset or notchjin the link will receive the stud 36, and in this position the pivotal connection between the lever` and link will be located in a plane below a line drawn through the grassward hooked endy of `the link 32 and stud 36.y 'Ihus it will be seen that the spring i 2,2 (Figs.- 3and 4) will maintain the lever 34 in jaw opening position until the lever is -manually displaced, Y l l Referring now to jaw controlling ymeans shown as applied to the opposite or stubble-L wardend of the pitman, it will beseen that 'thisform isembodied in an automatic takeup for the .journal box carried by the crankl pin. The pitman 10 has secured theretoby means of bolts 38 straps 37 which are similar totheresilient jaws 11 and 12 and are provided o n their stubbleward ends with conical bearing surfaces 39. These bearing surfaces are apertured to receive a slotted clamping bolt 40, by means of which the bearing box 41, which is provided with corresponding conical bearingsurfaces 42, is secured between the conical surfaces 39 of the straps 37. Said bearing box 41 is of hollow..con` struction and carries the usual oil cup shown at the extreme right in Figs. 1 and `2. Inf

tegral with one lof the straps 37, ,are lugs 43,y betweeuwhich is guided the shank 44 of a wedge-shaped take-up member 45, whichlatter extends through the slot in the clamping bolt. Mounted upon the shank 44 `on the grassward side of the lugs 43,is a

springf46 which bears at one end against the lugs 43 and is secured against displacement at the other end by the cotter pin 47'. j

I Il will describe rstythe operation of the automatic take-up `and jaw 4opening' member 16V on lthey grasswardend of .the pitman. Referring to Fig. 1, the member 16k is shown in'full lines with the jaws ll ,and 12 clamp "ing the spherical bearing surfaces ofthe knife head. In thisqposition'- the end 24 of the bellerank member 2,5 ycompresses the spring 22, and the spring acting against the f j stubbleward'end ofthe-.jaw closing member 16,- constantly tends to force said .member gr'assward and maintain the jaws in closed ing for the wear on these parts. In order to open the jaws, the arm 30 is swung up# Wardly to the position 'shown in dotted lines at the right in Fig. 2, in which lpositionthe ymember 15 is releasedy from the-action of 30 is swung to the position shown at the left i l j in Fig. 2in dotted lines, when the crank'27, Jthrough the`bellfcrank25, pulls the shank' 21 and lmember 16 stubblewardly, and the bearing'surface's 20` coperate with, the inclined bearing surfaces 14 at the inner endv of the slots 13 and force the jaws 11 and 12 outwardly to the extreme outward position.

IReferring now to the structure shown in Figs. 3 and 4, the jaws arjefnormallyv mainj. i

tained in closed position `by the spring22, whichacts between the grassward endk of the pitman` 104 and the member 16 to force.k the latter in agrasswarddirection andclos'e thejaws. To open;thejaws, the lever 34 is fulcrumed on the stud 36 and is swung rear-1' wardly, forcing' themember 16 against the tension of the spring 22 and `opening the" jaws in the manner above described. Y f

In order to assemble thefparts at the'stubblew-ard end .of the pi'tman, the .jaws-*37, arel sprung-` apart and the hearing7 box '41 is rook mounted thereon betweenthe conical bears,y Y

ing surfaces 42.: .Thel clamping bolt" `4071s theninserted through the conical bearing-` surface 39 and the apertured grassward end of the bearingbox 4 1. The w edgeshape ;1` member 45 is then inserted in thev slot in clamping jbolt 4() by first passing therej through the shank 44l of saidkwedge-shaped member, said shank being then positioned betweenrthe bearing lugs .43. yThespring 46 is then placed on the grassward end of` said shank and `is compressed sufciently ,i

to allow the cotter pin 47 ':to be inserted through the grassward .endUof--saidshank and maintain 'the springunder tension.y

It will be clearkf-rom the above description that I have providedsimple and 'efcient de vices for taking up the wear `of'the associl* ated and coperating parts atboth ends of vthe pitman and that the devices are ofsuch' las a nature lthat they may be cheaplymanufacc j tured and easily.y and ,quickly assembled.l

Moreover, ashas been fully pointed `out, the` l 'graslithe' coiperating part 'of *the knife head `While I havel for purposesjof illustration 'described certain specific `forms wl1ich-`1ny invention may assume? in' practice,j it will -be c'lear'that the saline vis capable of fma'nyother 'modifications and that 1-such` changes A'and modification may be' made without departing from the spir'of the invention as nex- Apir'es'sec'l"in the `appended claims.`

ilmh'at Iclai'm as 'new gand *desire `to secure by Letters Patentis:

l: In a piftmanco'ifi'n'ection,y a pitman'hav- `ingcre'siilient jaws iprovided with 'inclined 'exterior @bearing surfaces thereon; `and means ifor clamping saiicl Vj aws' linclndin'g ay longitudinally reciprocable member having inclined'ibeariirgsnirtaces icoperatfing with the bearing suraces on saidfj'aws, the bearing fs'untafces on 1 safid reciprocable 'member being shittable 4 from the i inside to f the idutside of asaidjaws.

Q; #In a pitmanconnection, a pitman having resilient jaws, 'al longitudinally recrprocable member for clamping said jaws, resi'lij ent "means for atuatingsaid member in one direction, and lever mechanism for actu-ating saidmemler inf' the opposite direction against the tension of said resilient ja-ws.

' ing resilient jaws provided with longitudinal slots therein, a longitudinally reciprocable jaw clamping Imember mounted between said jaws and extending through said slots, said clamping member having means coperating with said jaws to press the same toward each other, and means for reciproeating said member in both directions.

4. In a pitman connection, a pitman having resilient jaws provided with longitudinal slots therein, a longitudinally recipro- `cable jaw clamping member extendingthrough said slots, said clamping member having means for pressing said jaws toward each other as said member is reciprocated, resilient means for advancing said clamping member to jaw clamping position and means for retracting said clamping members. v

5. In a pitman connection, a pitman having 1resilient, jaws, and -means including a reciprocable member for positively spread` .ing said jaws.

6. In a pitman connection, a pitman having resilient jaws, and means including a reciprocable member carried by said pitman and operatively connected with said jaws for spreading the same.

'7. In a pitman connection, a pitman having resilient jaws, a longitudinally reciprocable member carried by said pitnlan forV spreading said jaws, and means for reeip` rocatmg said member.

8. In a pitman connectlon, a pitman hav-y ingslotted resilient jaws, alongitudinally reciprocable memberfcarried by 'said jaws and 'extending through'saidf slots, said niember having outer tinclinedfcam` surfaces `operativelyassociated;with `the walls of said slotsv whereby as sai'dllmember is reciprocated the jaws are spread, and means for reciprocating said member.

10. In a pitnian connection, a pitman ihaving fresilient jaws, aA `lo'ngitnd'inajlly reciprocablel jaw clamping member rmounted between safijd jaws 1andha'ving a shank portion, a -sprin'g icarrie'd by said shankortion, a 1ever carried by said pitmanwan ried by said level' and 'engaging said spring whereby said clamping "member "may be actuated by saidlever to jaw clamping position. `1 i ll. In ay pitmaln connection, ia' pitman havresilient jaws providedwithfinclined elongated bearing 'surfaces thereon, land means engalgeable withv said 'bearing surfaces tor' gradually clamping land `ttor spreading said jaws.

means car- A"lingresilient jaws with inclined bearing surfaces thereon, and a longitudinally reciprocable member having a plurality of bearing surfaces engageable with said inclined bearing surfaces on said jaws for clamping and for spreading the jaws.`

13. In a pitman connection having resilient jaws, a reciprocable jaw clamping and spreading member, resilient means for actuating said member in one direction to clamp said jaws, and means for actuating said member in an opposite direction to spread said jaws.

14. In a pitman connection, a pitman having resilient jaws, a longitudinally reciprocable jaw clamping and spreading member, and means including a crank mounted on said jaws for reciprocating said member.

15. In a pitman connection, a pitman having resilient slotted jaws, a longitudinally reciprocable jaw clamping and spreading member mounted between said jaws and extending through said slots, a stubblewardly extending shank carried by said member between said jaws, resilient means for actuating said member in one direction, and means including lever mechanism for actuating said member in an opposite direction.

16. In a pitman connection, a pitman having resilient slotted jaws, a longitudinally reciprocable jaw clamping and spreading memi means for reciprocating said member.

said jaws, a spring carried by said shank, a

bell crank lever loosely carried at one end and,v lever mechanism fory actuating ksaid Y Copies of this patent may be obtained for member in the opposite direction againstthe tensionfof saidresilient means; e

1,8. Ina pitman connection, a pitinan have ing clamping jaws, one of which is resilient, a longitudinally-` reciprocable member carried by said pitman for forcing rsaid resilient jaw away from the remaining Yj aw, and

19. In a `pitman connection, a pitman having resilient jaws,l a longitudinally reciprocable jaw clamping member mounted between said jaws-and having. a shank portiona'spring carried by said shankportion, a lever` carried bysaid pitman, and -a link member operatively connected to said lever and engaging `said spring whereby said clamping member lmay beactiiatedby said lever to jawclamping position. ,i s y l 20. In apitnian connection,a pitnianhav# ing clampingjaws, one ofwhioh isy resilient, i said resilient jaw beingprovided with elon- ,1

gated inclined bearing surfaces thereon, and means engageable with said bearing sur,- faces `for, moving said resilientjjaw gradually toward and fromsaid remaining jaw.

Y 21, vIn a pitinan connection, a pitman hav- Q ing clamping jaws, one' of which, is gresilie'nt such resilient jaw being provided withinclined bearing surfaces thereon, and a longitudinally reciprocable member vhavingal plurality of `bearingsurfaces engageable'f,

withv the inclined ybearing surfaces` on e said resilient jaw to actuate 'saidj-aw'toward and from the remaining jaw. Y e l j `22. In a pitman connection, a pitmanhavf ing clamping jaws, one of whichA is resilient, j a reciprooable member` adapted to actuate said resilient jaw `toward and from the remaining jaw, resilient means foractuating said member inone direction, and means for actuating said member in the opposite direc- Y V tion. i Us. In testimony whereof I affix my signature.

Jenn srunnocn ve cents each, by addressingy the *Commissioner 0f .Patents y y Washingtoiif). G.l i c 

